Judges 13:15 - 23
NKJV - 15 Then Manoah said to the Angel of the LORD, "Please let us detain You, and we will prepare a young goat for You. 16 And the Angel of the LORD said to Manoah, "Though you detain Me, I will not eat your food. But if you offer a burnt offering, you must offer it to the LORD." (For Manoah did not know He was the Angel of the LORD.)
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.